After the merging of Britain and the Fae realm and the vanishing of King Arthur, various factions — both mortal and Fae — now fight for power.

In Mordred, each player controls one of these asymmetrical factions and strives to earn the favor of the three great leaders: Mordred, Morgana, and Merlin. They must use the rounds available wisely as each action costs precious time. In the end, chaos will be inevitable, and players must prepare for it as the chaos will bring great peril, but even greater rewards.